added information about the naming conventions in schema.py
also:
* some typo fix
* note about ObjectRelation soon being deprecated
* clarified a few hazy points
#! /bin/sh -ecase "$1" in remove) if [ -x "/etc/init.d/cubicweb-ctl" ]; then invoke-rc.d cubicweb-ctl stop || true fi ;;esac#DEBHELPER#exit 0